Newbie here. I bought an Adventure Island 3 weeks ago and have taken it out twice. I am wondering how to store and care for the sail if it gets wet after a trip.Will storing it wet (salt or freshwater) cause mildew and rot?

I don't believe the materials are subject to easy rot but there's not many things that benefit from being stored wet or damp. When I return from a trip I always at least remove the loosely rolled sail from the storage bag and allow air to get to it.

Depending on who you talk to, salt can either be a preservative or act as an abrasive medium on the sail fibres, especially one that is rolled around a mast. I rinse my sail sometimes, its always stored on the mast and is showing very little wear or growth after three years. I use my boat 1-2 times a week.